A：人坐沙发，沙发凹陷
B：降落伞匀速直线下降
C：用力拉弹簧，弹簧变长
D：正在进站的火车
What's ________ name? His name is Zhang Peng.（ ）
You have _______ the book for a week! It's time to return it to the library.
一中学生的大拇指指甲面积约为（ ）
